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I am tossing around the idea of stretching out my 15 rtx le 1.7 out to a 153" and adding a 38" front end. I have a guy that wants to swap for my rr skid and 42" front end. What are you guys thoughts on this? he has a 2.5 challenger track to go with it too, I believe the 15 153 mtx has 7 tooth...

What settings are most of you turbo guys running on your ulmer clutch kit and what belt? Mine came with 2 heel and 4 in the tip with the secondary set at 6-1 with a pink sprintg. I had it set to 5 heel and 4 tip 6-1 wrap and a gates carbon belt I was getting a lot of dust and heat so I put it...

What is the max boost I can run on stock compression with out pulling timing? I have a mpi kit with intercooler and quick spool wast gate and I can not get the boost down even with zero pre load on the actuator I still creep up to almost 7 psi. Right now I have stock injectors but I have larger...

I have a quick spool wastegate actuator on my MPI trail kit with intercooler setup and I am running a pcv-pti instead of the gems so I do not have the EABC. I am having issues with it over boosting I have almost no preload on the actuator and I am still hitting 7 psi and running lean with stock...

I have a 15 viper with a MPI turbo and using the PCV PTI for fueling I also run a ignition module for raised rev limit. It runs fine the whole way though the rpm but once I put the flipper to the bar you can see AFR jumps to 17-19 from 11.7ish if at a dead stop if you pin it it would happen as...

I recently installed a MPI stage 1 kit and I was wondering do anyone know how much pre load should be on the waste gate actuator? I had to lengthen the rod quite a bit to get it to reach. Thanks Jeff

Hi guys do anyone know what kind of TQ numbers my viper should be making with the stage 1 on a trail kit at 5.5-6 psi with the race muffler/ ulmer header? I am also running the ulmer tuning on a PCV-pti not sure if that would count for a few foot pounds? Thanks Jeff

I have a few questions for you guys with MPI turbos, I have done lots of searching on the site and have found most of my answers but I still have a few questions. HEAT Is there any upgrading to the cooling system that I should do? Has anyone tried engine ice? Or is the stock cooling system...

Looking for some input on should I turbo my viper or not. Soon as the SideWinder came out I wanted to upgrade from my RTX-LE but I would take a major loss on the viper with only 2100km on it and a pile of money spent on power upgrades like: intake, header, muffler, clutching, and power...

Has anyone tried the Backcountry X2 track? I'm thinking about upgrading to a SideWinder RTX-LE and ill be doing a track upgrade, I have a Sno X on my viper now its a good track and really bites in the hard stuff but would a BCX2 do better for off trail in the deeper stuff? I know the Sno X is...

This is the first time I noticed a black mark around the top of my primary I have changed my tip weight recently to increase rpm and it worked and pulled like a champ then the weather changed and I was running in a lot of slush as I live on a 3 mile lake. Could this be related to the weight...

I have tried doing some research on fox web site but they give a wide range of air pressures for the evol rc2 and nothing by weight. I believe now I am running the main at 75 and evol at 150 the center shock I have increased the preload and 4 clicks on compression and I think I may need some...

I switched to the 8DN belt this year using the osp adjuster, I have 400 km on this new belt and I am getting a lot of belt dust much more the I did with a 8JP belt. Has anyone else experienced this? I have also notice that my engagement is a little jerky too. I assume the belt dust is a good...

Guys I know most of you have been around Yamahas for a long time and have lots of experience with racing them. I am looking for some opinions on what do you think is a better machine for building a drag/lakerunner from a SRX or a Vmax 4 ? I had a 99 Srx years ago and I know they have good...

I have installed Ulmers header and a osp exhaust i have some new mapping and i noticed a small pop / backfire when I come off the throttle. I basically have ulmers performance pack #6 with a different muffler. Has anyone noticed this before? Could it be from having such a short header and open...

I had a bolt come loose on the pivot point on my rear skid it had worn the bolt hole bad on the rail eventually the bolt fell out. Check and make sure they are tight and have loctite on them I'm waiting to hear back if Yamaha will cover the rail under warranty.

I have just installed a header from ulmer and it fit perfectly and looks great the sled has a deeper tone now. While installing it I did notice a few loose rivites and some were actually missing never installed around my heat shield which was also cracked. So if anyone has there tank off check...